Must have missed the part stating that the Cornwalls used A for 1963, and B for 1964, and that the first one used 3A09, same four-place serial number as mine has---had I seen that it would have helped, don't know how I missed it, thanks! By the way, as I'm missing this as well, but how do the numerals in the serial number 3A09 indicate it as being shipped in August? And, even better, what would that make mine, being 3B50? Thanks for the help!